How many words start with REP?

10, from 5 letters up to 5. All of them are on this page.

What is the highest scoring word that start with REP?

REPAY at 10 points in Scrabble, and REPLY at 11 in Words With Friends, because the two games score the tiles differently.

REPAY, REPEG, REPEL, REPIN, REPLA, REPLY, REPOS, REPOT, REPPS, REPRO.

10 of them: REPAY, REPEG, REPEL, REPIN, REPLA, REPLY, REPOS, REPOT, REPPS, REPRO.

There are 10 of them. The highest scoring is REPAY at 10 points in Scrabble, and the set averages 7.9.

Most common words first, then the rest A to Z.

The most familiar words on this page and what they mean. Tap any word for its full entry, score and anagrams.

REPLY noun a statement (either spoken or written) that is made to reply to a question or request or criticism or accusation
REPAY verb pay back
REPEL verb cause to move back by force or influence
REPOT verb put in a new, usually larger, pot
REPPS noun form of REPP: a fabric with prominent rounded crosswise ribs

Definitions from Open English WordNet, CC BY 4.0.

All of them: Word lists.